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From: Haris Javaid <Haris.Javaid@thoughtcorp.com>
To: "users-digest-subscribe@pdfbox.apache.org"
	<users-digest-subscribe@pdfbox.apache.org>, "users@pdfbox.apache.org"
	<users@pdfbox.apache.org>, "users-help@pdfbox.apache.org"
	<users-help@pdfbox.apache.org>
Date: Fri, 9 Dec 2011 12:39:11 -0500
Subject: Need help with Overlay for Layout pages
Thread-Topic: Need help with Overlay for Layout pages
Thread-Index: Acy2mXZrUrS8DS8cSJidcPPVNL/BdA==
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Hello there,
We are working on a product that supports highlighting PDF documents. We re=
cently came across a situation where when trying to highlight  a pdf that w=
as converted into a PDF from word by some third part library, threw Unsuppo=
rtedOperationException. It happened in Overlay.java.

private void collectLayoutPages( List pages) throws IOException
    {
        Iterator pagesIter =3D pages.iterator();
        while( pagesIter.hasNext() )
        {
            PDPage page =3D (PDPage)pagesIter.next();
            COSBase contents =3D page.getCOSDictionary().getDictionaryObjec=
t( COSName.CONTENTS );
            PDResources resources =3D page.findResources();
            if( resources =3D=3D null )
            {
                resources =3D new PDResources();
                page.setResources( resources );
            }
            COSDictionary res =3D resources.getCOSDictionary();

            if( contents instanceof COSStream )
            {
                COSStream stream =3D (COSStream) contents;
                Map objectNameMap =3D new TreeMap();
                stream =3D makeUniqObjectNames(objectNameMap, stream);

                layoutPages.add(new LayoutPage(stream, res, objectNameMap))=
;
            }
            else if( contents instanceof COSArray )
            {
                throw new UnsupportedOperationException("Layout pages with =
COSArray currently not supported.");
                // layoutPages.add(new LayoutPage(contents, res));
            }
            else
            {
                throw new IOException( "Contents are unknown type:" + conte=
nts.getClass().getName() );
            }
        }
    }

Below is the exception:


ava.lang.UnsupportedOperationException: Layout pages with COSArray currentl=
y not supported.

      at org.apache.pdfbox.Overlay.collectLayoutPages(Overlay.java:269)

      at org.apache.pdfbox.Overlay.overlay(Overlay.java:224)

      at com.thoughtcorp.annotation.AnnotatedFile.applyAnnotationsToPDF(Ann=
otatedFile.java:54)

      at com.thoughtcorp.services.SyncAnnotationsService.syncAnnotations(Sy=
ncAnnotationsService.java:26)

      at com.thoughtcorp.SyncRequestHandler.handle(SyncRequestHandler.java:=
60)

      at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.ja=
va:47)

      at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrap=
per.java:110)

      at org.eclipse.jetty.server.Server.handle(Server.java:346)

      at org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnecti=
on.java:589)

      at org.eclipse.jetty.server.HttpConnection$RequestHandler.content(Htt=
pConnection.java:1065)

      at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:823)

      at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:2=
20)

      at org.eclipse.jetty.server.HttpConnection.handle(HttpConnection.java=
:411)

      at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChanne=
lEndPoint.java:535)

      at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannel=
EndPoint.java:40)

      at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadP=
ool.java:529)

      at java.lang.Thread.run(Thread.java:662)

Can you please ask the developer who worked on the code highlighted above w=
as it not implemented coz it required a lot of work or was it coz he though=
t the functionality would not be required by many people? We were thinking =
if we could just implement LayoutPage.java to take in COSArray and operate =
on it. Would it be too hard to implement to support our solution? Another a=
pproach was to convert COSArray into COSStream so the code always catches i=
f block.

We are currently trying to meet a deadline and this has become a road block=
er for us. Any help in this matter would be really appreciated!

Thanks,

Haris


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